PIN-based authorization

The PIN-based OAuth flow is intended for applications which cannot access or embed a web browser in order to redirect the user to the authorization endpoint. Examples of such applications would be command-line applications, embedded systems, game consoles, and certain types of mobile apps.

When an oob callback is requested and the user visits Twitter, they will not be automatically redirected to the application upon approving access. Instead, they will see a PIN code, with instructions to return to the application and enter this value.